When playing Modern Warfare 2, and a game featuring a game-winning killcam is about to be won, a victory class is used to humiliate the other team, the reason being that the victory class is a random create-a-class, and usually consists of bad guns and throwing knives. This is not only embarrasses the other team, but provides an entertaining last kill of other players.

We're about to win, switch to victory class. I'm gonna humiliate these noobs.